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    Porphyrin nanofiber patterning by air/water interfacial assembly: Effect of molecular structure, surface pressure, and ionic liquid doped subphase

    Year: 2012

    Journal: Journal of Colloid and Interface Science, 2012, 369 (1), 267-273, 20131009

    Authors: Xufei Liu, Tianyu Wang, Minghua Liu

    Organizations: Beijing National Laboratory for Molecular Science (BNLMS), CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, People’s Republic of China

    Porphyrin nanofiber patterning was generated by air/water interfacial assembly. The air/water interfacial aggregation behavior of two prophyrins, both of which contain two hydrophobic alkyl chains and two carboxylic acid substituent groups at different positions, was investigated using UV spectra, FT-IR spectra, and AFM measurements on the corresponding transferred films. The porphyrin nanofiber patterning can only be produced on ionic liquid (IL) doped water subphases by the assembly of the building blocks with two carboxylic acids located at the para-position (TPPA2b-A). The results suggest that the bulky cations of ionic liquids (ILs) can interact with the carboxylate of porphyrin electrostatically. The appropriate molecular geometries, ionic liquid (IL) doped water subphases, and relatively high surface pressures help the TPPA2b-A to form nanofiber patterns.